Sound and Hearing

All sound is caused by vibrations. When something vibrates it moves backwards and forwards about a central position. The vibration that produces the sound causes the surround air particles to vibrate. These particles then collide with the other air particles which then collide with still others so the sound energy is passed on
1. If we give the air particles more energy then the sound will be louder
Compression
1. Rarefaction
  1. sound wave
Sound waves are collected by the earflap
1. The sound travels down the canal to the eardrum
  1. The eardrum vibrates at the same frequency as the sound wave
    1. The vibrations are passed on to the cochlea by a set of three small bones
      1. When the vibrations reach the cochlea, a liquid moves backwards and forwards
        The moving liquid stimulates nerve cells to make electrical signals
        These electrical signals are passed to the brain along the nerves
        The brain receives an exact electrical signal of the original sound wave

Resource summary

	Created by diddy@exam.time almost 11 years ago